Cooling system for vertical broaching machines



April 4, 1950 l v B. WELTE 2,502,907

COOLING SYSTEM FOR VERTICAL BRoAcHING MACHINES Filed June 18, 1947Patented pr. 4, 1950 UNITED STATES PATENT OFFICE COOLING SYSTEM FORVERTICAL BROACHING MACHINES tion of Delaware Application .lune 18, 1947,Serial No. 755,291

3 Claims.

This invention relates to vertical hydraulic broaching machines and moreparticularly to a cooling system for such machines.

In hydraulic broaching machines, difliculty has been encountered as aresult of the development of excessive heat in the fluid which is pumpedfrom a iiuid reservoir through conduits to actuate the movable elementsof the machine, and accordingly it is an object of this invention toovercome this diflculty in vertical hydraulic breaching machines.

Other objects of this invention will become apparent from the followingdetailed description taken in conjunction with the accompanying drawingin which:

Figure l is a partially broken away side elevational view of a verticalbroaching machine employing the features of this invention; and

Fig. 2 is an enlarged sectional View of the structure illustrated inFig. 1 taken along the line 2-2 thereof.

In accordance with the present invention, the requisite degree ofcooling is achieved by a cir- Culation of air over the motor, pump andhydraulic pipes and valves, and the desired rate of air circulation isachieved in large degree by utilizing the relatively tall vertical frameof the machine as a chimney to induce air circulation.

The present invention is illustrated in conjunction with a pull-upvertical broaching machine of a more or less conventional type. Themachine as illustrated comprises a vertical frame generally indicated at3, which includes the usual supporting base 5 and a horizontallydisposed table 1. A ram is mounted in suitable ways in the upper portionof the machine, and is adapted to reciprocate vertically under theinuence of a hydraulic cylinder, or other conventional means (notshown), toward and away from a Work supporting bracket 9. It will beunderstood, however, that the invention is equally applicable topull-down vertical broaching machines.

A substantially hollow vertical column II is provided in the upperportion of the frame 3, rearwardly of the ram 9, and is defined by theframe side walls I3 and I5, a back wall I1, and front Wall I9. The backwall I1 extends over the top of the side walls I3 and I5 and the frontWall I9 to provide a top wall 2I for the column. The bottom wall of thevertical column II is formed by means of a plate 23, which is disposedbetween the vertical walls of the column, at the lower end thereof. Anair outlet opening 25 is provided adjacent the upper end of the backwall I1. An air inlet opening 21 is provided 2 adjacent the lower end ofthe back wall I1, immediately above the/v bottom Wall 23, and thisopening connects the interior of the column with a chamber 29 formed inthe lower end of the frame 3.

The rear Wall of the chamber 29 and a portion of the opposed side wallsthereof is formed by a sheet metal hood 3| of a generally inverted Lshape in vertical cross section. The upper horizontal wall portion ofthe hood 3| is connected to the back wall I1 of the vertical column at33, immediately above the opening 21. The lower end of the end wallportion of the hood 3| is connected to a plate member 35, of the base 5,at 31, so that the plate 35 forms the bottom of the chamber 29. The sidewalls of the hood 3| abut, and are secured to the rear edges of theframe side walls I3 and I5, at 36, so asto enclose each side of thechamber 29. The lplate 23, in the lower end of the vertical column I I,forms a portion of the top wall of the chamber. The forward end of thechamber is enclosed by means of a wall 39 which extends verticallybetween the base plate 35 and the lower wall 23 of the vertical columnII. It therefore can be seen that the chamber 29 is defined and enclosedby the various Walls described, and .communicates with the verticalcolumn II through the opening 21.

Mounted on the plate 35 of the base 5, substantially directly below thebottom wall 23 of the vertical column, is a conventional electric motor4I.

The drive shaft 49, of the motor 4I, extends rearwardly beyond the motorhousing, and a coupling member 5I is drivingly secured to the rear endthereof. Radially spaced fan blades 53 are mounted on the forward end ofthe coupling member 5I, and are adapted to be driven by the motor 4I.The rear end of the coupling member 5I is connected to a second couplingmember 55 which in turn is connected to a conventional fluid pump 51, sothat both the fan blades 53 and the pump 51 are driven by the motor 4I.The pump 51 has a conduit 59 extending downwardly therefrom into a iluidreservoir 6I, which is disposed in the base 5, below the plate 35. Thefluid is pumped from the reservoir 6I through the necessary conduits 58to the hydraulic mechanism of the machine. The conduits 58 may extendupwardly, from the pump 51, through the vertical column II, and throughother parts of the malchne, in order to be connected to the hydraulicmechanism (not shown).

The side IWalls I3 and I5, of the frame 3, are provided with openings63, immediately to the rear of the vertical front wall 39 of the chamber29, and adjacent the forward end of the electric motor 4I. Screens 65are secured to the walls I3 and I5, over the openings 63, to filter outforeign particles and the like. These apertures 63 permit air to bedrawn into the chamber 29, in which the motor, fan and pump are mounted,and when the motor 4I is operating it will draw air through its housing.Likewise the fan blades 53 will draw air, from the openings 63, throughthe chamber toward the rear end thereof.

An inverted U-shaped housing, generally indicated at 61, is positionedover the rear portion of the motor 4I and fan blades 53 and has its side-walls 69 secured at their forward end to the base plate adjacent theframe side walls I3 and I5, at 1 I. The housing side walls 69 convergeinwardly toward the rear end of the chamber 29. The top wall 'I3 of thehousing S'I has its forward end secured to the rear edge of the lowerwall 23 of the vertical column, at 15, immediately be- 'low the opening2`I. The housing 6l' is opened at its front and rear ends and acts as ashroud for the fan 53. The housing 61 also directs the air into the rearend of the chamber 29, where the arcuate back wall 3l directs it throughthe opening 21 and. into the Vertical column I I.

As the vertical column II is closed except for the opening 21, at itslower end, and the opening 25, adjacet its upper end, a chimney-likeeffect is obtained, so that the air in the chamber 29 is drawn into thevertical column, and flo-ws out the upper opening 25, into thesurrounding atmosphere. Therefore, a constant flow of fresh,

cool air is constantly passing over the pump 51 and up through thevertical column II, so as to cool the pump and at least a portion of theconduits leading therefrom. This in turn will cool the uid which ispumped through the conduits and so eliminate the diiculties previouslyencountered.

Due to the chimney effect of the vertical column and the usual aircirculating fan conventionally incorporated within electric motors, itis not necessary to employ the fan 53 to obtain an adequate degree ofcooling effect. The cooling effect, however, is further enhanced by thefan 53.

I claim:

1. In a vertical hydraulic broaching machine a main frame defining ahollow vertical column, means defining and enclosing a chamber in thelower portion of said frame which is in communication with the interiorof said column, said means having an inlet opening therein to permit theentrance of air into said chamber, said vertical column having anopening adjacent the upper end thereof communicating with theatmosphere, a fluid pump and motive means therefor mounted in saidchamber in the path of flow of air from said inlet opening into saidcolumn, and a fan disposed between said fluid pump and motive means andoperatively connected with said motive means for enhancing the flow ofair over said fluid pump' through said chamber and into said column.

2. In a vertical hydraulic broaching machine,

a main frame defining a hollow substantially closed vertical column, afluid operated toolsupporting element movably supported on said frameadjacent to and exteriorly of said column, a supporting base for saidframe, means providing a fluid reservoir in said base, means defining asubstantially closed chamber in the lower portion of said frame abovesaid base, means providing communication between the lower portion 0fsaid vertical column and said chamber, said chamber-defining meanshaving an inlet opening therein to permit the entrance of air, saidvertical column having an air outlet opening therein adjacent the upperend thereof through which air can ow from said column, a motor mountedin said chamber, a fiuid pump mounted in said chamber and operativelyconnected with said motor, fluid conduit means connected with said pumpand reservoir and extending through said chamber and column toward saidtool-supporting element, said pump, motor and at least a portion of saidconduit means being disposed in the path of flow of said air from saidinlet opening to said outlet opening.

3. In a vertical hydraulic broaching machine, a main frame dening ahollow substantially closed vertical column, a uid operatedtoolsupporting element movably supported on said frame adjacent to andexteriorly of said column, a supporting base for said frame, meansprovidingv a fluid reservoir in said base, means defining asubstantially closed chamber in the lower portion of said frame abovesaid base, means providing communication between the lower portion ofsaid vertical column and said chamber, said chamber-defining meanshaving an inlet opening therein to permit the entrance of air, saidvertical column having an air outlet opening therein adjacent the upperend thereof through which air can flow from said column, a motor mountedin said chamber, a fluid pump mounted in said chamber and operativelyconnected with said motor, fan means disposed between said fluid pumpand motor and operatively connected with said motor, fiuid conduitsconnected with said pump and reservoir and extending through saidchamber and at least a portion of said column toward saidtool-supporting element, said pump, motor and at least a portion of saidconduits being disposed in the path of flow of said air flowing fromsaid inlet opening to said air outlet opening and enhanced by theoperation of said fan means.

BENEDICT WEL'IE.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2,102,183 Montgomery Dec. 14,1937 2,140,838 Hart Dec. 20, 1938 2,210,458 Keilholtz Aug. 6, 19402,257,89 Martellotti Oct. 7, 1941 2,380,747 Goetz July 3l, 1945

